Galaxy Quest

Galaxy Quest is a 1999 American science fiction film directed by Dean Parisot and written by David Howard and Robert Gordon. Mark Johnson and Charles Newirth produced the film for DreamWorks.

The film follows the cast of a oncepopular television spaceadventure series called Galaxy Quest. The fictional series starred Jason Nesmith Allen as the commander of a spaceship called the NSEA Protector, Alexander Dane Rickman as the ships alien science officer, Fred Kwan Shalhoub as the chief engineer, Gwen DeMarco Weaver as the computer officer, and Tommy Webber Mitchell as a precocious child pilot. Guy Fleegman Rockwell played a bit role in one episode, an unnamed security officer who was quickly killed off in his only appearance on the show.Eighteen years after the show was cancelled, the cast make an appearance at a Galaxy Quest convention full of dedicated fans. Jason enjoys the attention the rest of the casts attitudes range from apathy to Alexanders open resentment that he is known only for his alien character. Jason is approached by a group of people who say they are Thermians from the Klaatu Nebula. Jason agrees to go with them to what he assumes will be an amateur filming session, but the Thermians really are aliens, octopoidal creatures using a device that makes them appear human. Technologically advanced but having no concept of fiction, they have mistaken broadcasts of Galaxy Quest for historical documentaries and modeled their society on the ethos presented in the show. They have built working versions of the technologies portrayed in the show, including the Protector starship. ........

Source: Wikipedia